[FEATURE] Add german installer translation

[ElBe-Plaq]

Description

Added German installer translation.

Closes #39.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Something else

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new errors or linter warnings
• My changes generate no problems with other code
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests passed locally with my changes

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
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✅ BASH	bash-exec	1		0	0.0s
✅ BASH	shellcheck	1		0	0.05s
⚠️ BASH	shfmt	1		1	0.02s
✅ COPYPASTE	jscpd	yes		no	1.41s
✅ CSS	stylelint	3		0	0.9s
✅ EDITORCONFIG	editorconfig-checker	44		0	0.11s
✅ HTML	djlint	1		0	0.54s
⚠️ HTML	htmlhint	1		1	0.24s
⚠️ JAVASCRIPT	standard	1		1	1.66s
⚠️ MAKEFILE	checkmake	1		1	0.01s
⚠️ MARKDOWN	markdownlint	15		5	0.75s
⚠️ MARKDOWN	markdown-link-check	15		3	8.75s
⚠️ MARKDOWN	markdown-table-formatter	15		1	0.24s
✅ REPOSITORY	checkov	yes		no	9.92s
✅ REPOSITORY	devskim	yes		no	0.64s
✅ REPOSITORY	dustilock	yes		no	0.01s
✅ REPOSITORY	gitleaks	yes		no	0.22s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	kics	yes		no	14.27s
✅ REPOSITORY	secretlint	yes		no	0.72s
✅ REPOSITORY	syft	yes		no	0.39s
✅ REPOSITORY	trivy	yes		no	4.13s
✅ RUST	clippy	yes		no	21.58s
⚠️ SPELL	cspell	47		201	20.1s
✅ YAML	prettier	15		0	0.81s
✅ YAML	v8r	15		0	11.74s
✅ YAML	yamllint	15		0	1.94s

See detailed report in MegaLinter reports
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[mergify]

Merging pull request

Checks:

Name	Status
label	✅
MegaLinter	✅
Summary	✅
pre-commit.ci - pr	✅
docs/readthedocs.org:i-language-rust	✅
CommitCheck	✅